No, the 340 were per month, the 40 hours are per week. I usually do back-of-the-envelope calculations with 4.3 weeks per month, which would leave them below 2 EUR/h.
Edit: But you are of course right about inflation! According to this website[1] it would bump them to 3.2 EUR/h.
Edit: But you are of course right about inflation! According to this website[1] it would bump them to 3.2 EUR/h.
[1]: https://www.inflationtool.com/euro-netherlands/2005-to-prese...